diff --git a/source/ParserRules.cpp b/source/ParserRules.cpp
index b375c51..f979380 100644
--- a/source/ParserRules.cpp
+++ b/source/ParserRules.cpp
@@ -219,6 +219,11 @@ void Parser::statement() {
   case KW_while:
     next_token();
     expression();
+    if (tk.name == KW_do) {
+      next_token();
+    } else {
+      panic("<do>", { First::block, Follow::block });
+    }
     do_statement();
     break;
   case KW_if:
diff --git a/tests/test1.png b/tests/test1.png
new file mode 100644
index 0000000..4adc942
Binary files /dev/null and b/tests/test1.png differ
diff --git a/tests/test1.txt b/tests/test1.txt
deleted file mode 100644
index 23767e9..0000000
--- a/tests/test1.txt
+++ /dev/null
@@ -1,27 +0,0 @@
--- funcao bem util
-function array_sum(array, id)
-  local total = 0;
-  for elem in array do
-    total = total + elem;
-  end;
-end;
-
--- fatorial
-function factorial(n)
-  local value = 1;
-  for i = 2, i <= n do
-    value = value * i;
-  end;
-  return value;
-end;
-
--- fibonacci
-function fibonacci(n)
-  local fib0, fib1 = 0, 1;
-  for i = 0, i < n do
-    local tmp = fib1;
-    fib1 = fib0 + fib1;
-    fib0 = fib1;
-  end;
-  return fib0;
-end;
diff --git a/tests/test2.png b/tests/test2.png
new file mode 100644
index 0000000..bcd85e0
Binary files /dev/null and b/tests/test2.png differ
diff --git a/tests/test3.png b/tests/test3.png
new file mode 100644
index 0000000..d2d905a
Binary files /dev/null and b/tests/test3.png differ